Cabbage (Brassica oleracea var. capitata)
Alternaria blight (Alternaria raphani)
Symptoms
- The pathogen affects leaves, stem and seeds.
- Symptoms of the disease first appear on the leaves in the form of small, yellowish, slightly raised lesions.
- These lesions enlarge with concentric rings to form target board appearance.
- Lesions appear later on the stems and seed pods.
- The infected seed fails to germinate.
Management
- Use disease free seeds.
- Collect and destroy the infected plant debris.
Chemical Control
| Sl.No | Generic Name | Trade Name | Color code | Dosage/litre | Knapsack Sprayer (Capacity 10L) | Recommendation | Remarks | |
|---|---|---|---|---|---|---|---|---|
| Dosage/acre (200 L) | Dosage/hectare (500 L) | |||||||
| 1 | Copper hydroxide 77 WP | HiDice, Kocide 101 | Blue | 1 g/litre of water | 10 g | 200 g | 500 g | - |
| 2 | Mancozeb 75 WP | Devidayal M-45, Dhanuka M 45, Dhanuka M-45, Dithane, Dithane M-45, Hilthane, Hindustan M 45, Indofil M 45, Izeb M-45 Manzate, Luzen-45, Macoban, Macoban M-45, Mancosaan, Mancosaan M-45, Maneb Manzane, M-Guard, Savour M 45, Tata M-45 Eurofil-NT, Uthane M-45, Veera, Zinthane | Green | 3 g/litre of water | 30 g | 600 g | 1500 g | - |
| 3 | Copper oxychloride 50 WP | Bensaan, Blitox, Blue copper, Bluetrox, Copter, Cupramar, Cuprina, Dhanucop, Fytolan, Fytox, Fytran, Fytolan, Hilcopper, Killex copper, Maincop Dhanucop, Star cop, Tagcop, Trucop | Blue | 2 g/litre of water | 20 g | 400 g | 1000 g | - |
Extremely Toxic
Highly Toxic
Moderately Toxic
